Not difficult, but it take a bit of doing. The video pretty well says it all. You will probably want a few tools.
But if you're thinking of taking off the gas block/front sight post (and I would!), I would be tempted to make it into an A1 "dissipator".
Remove the front sight post gas block, and replace it with a low profile block that will fit under a set of handquards- you can find them for $30 or so. Then mount the front sight post with your triangle end cap at the front of the barrel, and put a full rifle length A1 handguard on it. To top it off, get a trident flash hider.
10x cooler than a carbine length handguard, for very little additional effort and expense. And the additional 6" of sight radius will make you more accurate with it.